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1. For the purposes of heading 4702, 'chemical wood pulp, dissolving grades' means chemical wood pulp having by weight an insoluble fraction of 92% or more (for soda or sulphate wood pulp) or of 88% or more (for sulphite wood pulp) after one hour in a caustic soda solution containing 18% sodium hydroxide (NaOH) at 20 degrees Celsius, and for sulphite wood pulp an ash content not exceeding 0.15% by weight. 2. For the purposes of heading 4706, 'pulps of fibres derived from recovered (waste and scrap) paper or paperboard' includes pulps obtained from such materials mixed with other fibrous raw materials, provided that the predominant fibre content (by weight) is derived from recovered paper or paperboard.